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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '16342dc785d156ae3fe5d332ea3dcb32f2ea03b6ac66fcbfdf1c21559e91166b' 
  AND token = 'n+/kGaJ7NClvpfKH0JU7htJ/zsIkZ3KT08s2QO0em4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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