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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f8a727e1d17759124776e59eb2b5557199750f7293eef10f75dcd0686b57267' 
  AND token = 'u8naXyOCnFbWltnxQnvjyS2zCHQKkzdM+Y4wq5hwkX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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