Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9102db2171886ba0f17804f74efd7fc196d4bfbd7620fbb2eb28cd8a24a70577' 
  AND token = 'iwjPQIMeNSxsMhwoBpbd3OQejCBuJC2GM9PS5IaqZlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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