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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06cf1dc3476580ca104ae5be2321ed8a5018039e5de5884d1ace146169a17457' 
  AND token = 'sjdEUszoIJ6ruDQD46YA7C9jjjmmgNvy/BZ7KXYMvi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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