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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd431b81992d9355caebcb420201cc5ecdd8e55fc6fdc73d841ad807f2d2fd8e0' 
  AND token = '2JSU2izdDkNe2P9SS88e9YGTn+YgmqdxLPUk9qBKidM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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