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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7daa8ecef9626fbf3c7f7503486d62918813e04112bcbe504daf3c88219abcdf' 
  AND token = 'ObZFcTf5PCZuDgpRPIWIStamJC/dvoo66B1tNxjTJa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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