SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e5974051cee60454780f9ac37ab548e42832e69a139b7f08df4a264dba76bd6e' 
  AND token = 'oztB7dyqJpeYqVRr7IXZLBJIj5gfbnToTudnh5dA+iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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