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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '499230f848f954dae6ac78f5d7d206efac66e201a096f0c10161c5142a14676a' 
  AND token = 'i6qLUESySArT4+OsktO/PQndJnNXHSu0/0gt0Wx2r2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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