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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '218fcd9423c58de4e735215e6c51226444daee25e6b0d75c021f195dd1d1f5dc' 
  AND token = 'Bz8qL8CfFZsYlamTkouOWpKXunCeagv5jsD8f591Pd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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