Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5da305537518c26b8ccd9bd583621193efb267b1270ce63ea379271919d41db9' 
  AND token = 'SW+2BbXiTHMip9C2KLlGOd0FJFq4EoJqXgsxC10Zoqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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