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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34fb60873f68493f4bdccdff78a589e5a4edc8d05cf88d8617dea58168d50155' 
  AND token = '4F4mMmxKYTP1/Bmuom0otjL3MTVg0Q4a01MlaT3UXyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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