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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dec16a666d309464d9d37298bc722f9ec3a0a94a9b2ca8131d3d9140df260dc0' 
  AND token = 'U1M9SUwLIBD4wyOE2cGYjcCqtWMa67ZDFNpfLFkW1Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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