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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02c1a708172835a5192b7c719d38748986200600f6ddc57b10567519a11a4f42' 
  AND token = 'JNpeRIxjEGm6DN/CI7vRbNkqdv2Ex7ZvQEsQXooKi0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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