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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19b8bd61a76219d3b767a270f5b92240f864f11267df45e819e1f990054542b8' 
  AND token = 'WruVlgtjuthJTsSubQmitH22WOVwpD/AOnNOnnevVNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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