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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60d9b20b14ad5070889ec297d956d094d526f0775fe2c02956545b35cb89d4f5' 
  AND token = 'dCKiWwuHcHpYTOIsj+HQ591zbcBhVE/7tc0V9FVTrY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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