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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd08326377ab05fba1e60a39d3ca57b3a6dac4204c2d3fadc1566f9c5782e7e69' 
  AND token = '9erQd9yYat2km6aaQ0q60FIg08QQAXmx460SD561KFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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