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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ff7879281ed7a34f6b5924ca54b90854ddf82b7c0dd2ed783ab72954501f715e' 
  AND token = 'AvJAAt7qeBTl9o2XjXIz0o2Na7Ft+llMqh9arwsui3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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