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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f27c5c6e28122a00ff6ed966d10163625333758fbe49bb142594d8871f99544' 
  AND token = 'ghpxkK7HtcCUGlcxdidvZPD+uExANqnEqcfAkC7Rdn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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