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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7aa0daa8023039164142d49d760d600cd52f16d43480c464a799aeb4b45d6268' 
  AND token = '2gtcs2040PQavTtrAbpHfREO2UCDWviUZ0e3JFSn3mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}