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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32174dcf278af84daa6d8100b1e26c438cb7517708151c4afdf71ebd20917528' 
  AND token = 'EI+02egIUmD0aPWTmoOjbP7hjo7hif/OKFPxUTdbLuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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