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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0456d84d961cf01b8994e09dea772bd16be1ca331c3d9547589f5bb80c789860' 
  AND token = '9d6CkX9AnW4Z8aAss1ha6JMAnbL5fQ4zf/Ey1YqjxXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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