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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69576e2759d8d2a15392f0c33dc0558425865fa58f872ea3adf1bda0f00b959e' 
  AND token = 'Sdbs5dqkIDcACMv/nRYfuf9QWT7MRwgb1CxcxUZ6/Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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