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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2466c016bdc6a897d6123dfc770ca72e348d345313143a5f68ec8b5f96fcf594' 
  AND token = '7Zg8iM1H1yWXkQVWgRHDWxtXVThs1X7G7AdTdo2z6uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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