Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5b81d53188ad0ebb72a58df08b5b7894afb0b5bbe44f03bcb749746d9a967c' 
  AND token = 'D1AHzq8prZPbGx1TLc7c3Tn4EP4WlltNNTVXI7PGwvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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