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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b33281e0973f1e522dc3508289f991624da4bf8ea28245d1d98c38de0b7fd6ca' 
  AND token = 'QovRnF5/Ln8zQY9wdyMycP1alYcPUtACNJydpNPMYFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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