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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0ed4c31ba40e6e18199bf7d858ed41cefe631ca5e1be5e776d5f5eab9e7f64e' 
  AND token = 'qQb01hNWDBEeJUPAaVrI/DLoZghkGlnyQjSJSQlBbfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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