Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e229b9d8e17b812c0d8af326db134488e96c6a7ed653d468b6a0ba5d0154c9' 
  AND token = 'mUhsAQPVQe+l0GTAJU37lEjQN10qeQ+wTP01zTTD1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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