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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bebcf89880ced71c29f7b9af674411d61b12bfa9a01221779662032a1bfcf013' 
  AND token = 'LDHX6DGcgyultfOe3CH63rPDf8EPBf1nMlQDlWLrAkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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