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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'afc141ab88a6f6f009b7945a8c6f6897001abb7e89172caaa176685925742ccf' 
  AND token = 'YRO9vUPH+8NIyAwPrpq0AscuqYdlZMF7b517b2PoFC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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