Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdd6a48e92adcf5928416a7ec21028fdd07a745e1c54894a7c681a1b9aa2b59' 
  AND token = 'znQDqjwXtjpjGhWsD01LLnPgCu1CrrkQkngfEWMyOOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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