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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea00f2936dfb882d2bb39b78ebb57a4eed4d9638ffda6fd0760e52d575cac213' 
  AND token = '9kxfo4LZjTPyXmqkSOEGNsuy/FhQFdd9kHvPhFx6SpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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