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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2b90acf08982e9f6c4128f63f5b582c77e01949fa490c5736b3cd41e10b972d2' 
  AND token = 'xLmDI74sNZV8NlOO98OxT/n00uuOb90xl+oQzgTJJxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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