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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06671d3445699158e1161a2fc12c76a12aee659c4184ea85353e3eb7615e00db' 
  AND token = '2DLzHJm1D/AlfFTg7bAFLliNINMjE0Fhli98/6elL0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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