Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1715dde7d1072016604169377f03ce15c7e9053c776b786121b3428d02b0b110' 
  AND token = '3UjfaUEo+bOBnYdSJWM7TEyR28GRhlzE3ZL5FJOcwfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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