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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '258d3257e29ec47602761a4fde51662f8d56e0402052720e98e4a57c3f05bf37' 
  AND token = '092FQYabhh6t2brziq1u4nnThkSbX99jsbEKHbc+GvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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