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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '402cfa4abbb9ffd5d214cd0bd7eb84c538614ae3f487e53d89181650d9fd7e5c' 
  AND token = 't6vdvVwbWJas8pNMkTVROwu2QBvuI3UPoeoZpL3HY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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