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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba58165ff13cfb2ca10463cd515735c46f38b583be9e1b67b0accca18fc4e1c0' 
  AND token = 'hW/vrqfJOzleZMzfiI5fKGbVQZmze9Q6YLkaUtkL5q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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