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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7556158d80df322ea31b991dcb4e7a8871ee055c557ac175e9ee93b2551724fe' 
  AND token = 'KXkRKE/maxr3iSNn4Kj8/ntIZ3QWTqJHKUURrZHfqGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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