Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea8e7a8fa89c10b927f3c03c79869d90cce5d35c220b0a4747b5e5928d7b6c56' 
  AND token = 'CLsGUmxKDpOushcr5+rCuz/eCr/Y/LsMp2RnOAK/K5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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