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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3fb259b587000cae0f2cbb1d5f7f97c063685d4a92e3a93cb8dabbdea04aadd6' 
  AND token = 'HE2mGNH9e7FjbDP1ErVg2XfH9xLjjIjUqLlfe4dgkI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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