Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6af6e4052049f6a411243704e030e186c83782cf8abedd609f9badbfdac5ae' 
  AND token = 'F81ICzxj2kQk22Sym/EPIMd8Q9GCRXLHCj+RRuJcRVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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