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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4b50a0f35515147b516b93ce26233dbc8dd0160c04cdb2374767f9c44f31a117' 
  AND token = '0xhrwjrRxLy0K29auCWrrA/+eGuA16hsymJE3mxK/zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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