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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe756e9e8f24e59c09e85c96920242f931c217dea6300eb71d41c7003b2e8072' 
  AND token = '4KFQn0mdyz1R5kn54avTJFuPs3xsufx4HhHzmrXlH+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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