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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6c7cb5c64c412e8378f5fcb2e807b562acf9ce76a691378682df4f73a18fef1a' 
  AND token = 'wq438nl1Pb8YDjrCkVaHjWt50kW9OgMM3Iqn38A2H5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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