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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb4db85c16136917838eb534a00878ddaf96d46c2c4b24232a84b74d26e74297' 
  AND token = 'cE3VJKp5c7wbrt5I4HCeCDXYIlJZUipC5iMeUA7l3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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