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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '97a14e0877f84ec5a9a386db2b8677aa8b2e8fd687484ebbcd0b0ef7b285fa92' 
  AND token = 'dH3IC6qJon/Ib3a6ulQhsNiYAiIqZM6WkIwlkAfP1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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