Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4804c5bb6d80d414710f3df4ca4217926ff65b8ea6cdd123cd9357cc5fc1c973' 
  AND token = '/xHe+aP5dyeJjXpMRcUNtpLiaT2T3Ts05jl9x/vV7Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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