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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8c3c88f4318a34cfae16bdd554956be52706e58e6f159160d4203abf1aadc00c' 
  AND token = 'zm47LZLIUuwa46AN5mfsSw38RYsexjUZQyyMA+8pUmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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