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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6e18394ef6384f934b13fde796c3d51ab2efb2b15c0be2900ecb7bdf1e72ead0' 
  AND token = '+DG6o0Auc7lE5IJHUCj+A/3iGsE/rVmcIGFQV0+6ov4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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