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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e4aec32b77c4d83935aaed1e1ed54946ef1bd53df637a40bd4f5e55eea712d8' 
  AND token = 'qoAQR0wEI5gm0bMmGxTyvr5lUvS1gU6EKNfN2/hNvAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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