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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1948167624853f790c67183a3ef7c7963bc0236e51e6d58b748de9291e7815b7' 
  AND token = 'E9AMdfic+Suc11ONRes1wSLc1tJHfe+LWTcUDqpBlvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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