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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fabb37c8dff520de0b49de41006d5985328466da30da3eaa636209ad93ecd884' 
  AND token = 'OnLmBPu50xeJBCQgksTH1QvJojTjkSUl0q8NgUhXXTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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