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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f97acca29c85dc4de502e56ef046babb25a367cbf5a2eab5d28e3d85a9b5c0fb' 
  AND token = 'X9XU/5hfcsEgHzPXTqtJk3vHE9Nq1wifxVoc2BM1EY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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