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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '40e62f828fb1ba156e8423f05513813954ed326982af419488c1ddae8c5c1127' 
  AND token = '8BmXU25lPAm+GNrzPsncHedZAt++RkMoUg5B/uDn7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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