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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a15aa2f318e81e57712e1ae747f290992b3d22dbd6fb4abd886f04f23a75843' 
  AND token = 'ExeMgDvIpio2Nj2A9VZ5XL8UyCAcThQq5mEyxJEDSTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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