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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13b3a04d57d42293c362b4bb123f42b0659196bcb43f230a6e6d96a492ed86f4' 
  AND token = 'FCp/A7xcU9hM9KWCRZtxWQefY966BvDO6nDhznkQ0Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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