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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9f10666790484626ce3bf89e71f7e5c74bd617e46df536e79705caf59c45234' 
  AND token = 'lCRNZfGHhhM5S5HD9PR9X4yHwd8Kxo8+cn5efSikPIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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