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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7be916435a61731a123efbe42a49df71e0410302f045edd20c0191fd3535d73a' 
  AND token = 'TtbyNshOdPXOdMAkNoo4OKRc8gskhfaC9Coj6K3A1vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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