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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c20661fa2f3dfae7f447b3caf65766727ea0ad7f83e15c5d039c102df870a370' 
  AND token = 'GErCgZz1m4ArZoGUFtV/I2awjzW0ZhtooZflc2AhtYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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