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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98f82e1b9c1b3e5d97e054ff5fd495f58f636dc857819915bd007d728407220c' 
  AND token = 'lH/Wokk2+WWNS+GQgurVO9tTbQyAEjedRNIXCaaA+3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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