Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad5d1ece8161a90ed086ceaac56ea20946289dafd327975f6a7656e5e2be2b07' 
  AND token = 'XU6KCWMcpIklgSuMa1BFfp+gbWdhxB2M33NFSLajusQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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