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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1c7246cd54de0e3943f5765589521283f150b893b3d3a486876614c1363d2bd1' 
  AND token = 'Nsz1+ogp5+Na3DRmJdKStxgANHawb+d8n9AV1CeyWes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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