SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f2b40b6deb52e46f4e830429d6d7596516ea77ebdf000d7c36d1f00fc571581' 
  AND token = 'HMLgPJRg3rV4K5MP2M2lPJhVcQ98RXRQ1+j5qH+q5Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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